Main-Topic: Time, Speed Distance (TSD) Subtopic: Trains and Platforms. you'll be given some data and asked to find the length of railway platform or speed of train etc. Visualizing the Concept: Train and Pen Case 1: One Train One [...]
Q. How many ways can four children be made to stand in a line such that two of them A and B are always together? (-asked in UPSC Prelims 2010) Confused? You won't be, after reading this. DONOT Proceed [...]
If the following questions make you uncomfortable, then read this article. In how many ways can 5 member committee be formed out of 20 students? Or How many ways can the word “UPSC” be arranged so that “U” is [...]